/*------------------------------------------------------------------------------
* Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team
*
* Distributable under the terms of either the Apache License (Version 2.0) or
* the GNU Lesser General Public License, as specified in the LICENSE file.
------------------------------------------------------------------------------*/
#ifndef _lucene_util_FastCharStream_
#define _lucene_util_FastCharStream_

#if defined(_LUCENE_PRAGMA_ONCE)
# pragma once
#endif

CL_NS_DEF(util)
class Reader;
CL_NS_END

CL_NS_DEF(util)

/** Ported implementation of the FastCharStream class. */
class FastCharStream
{
	static const int32_t maxRewindSize;
	int32_t pos;
	int32_t rewindPos;
	int64_t resetPos;
	int32_t col;
	int32_t line;
	// read character from stream return false on error
	void readChar(UChar &);

public:
	Reader* input;

	/// Initializes a new instance of the FastCharStream class LUCENE_EXPORT.
	FastCharStream(Reader* reader);
	~FastCharStream();

	/// Returns the next UChar from the stream.
	int GetNext();

	void UnGet();

	/// Returns the current top UChar from the input stream without removing it.
	int Peek();


	/// Returns <b>True</b> if the end of stream was reached.
	bool Eos() const;

	/// Gets the current column.
	int32_t Column() const;

	/// Gets the current line.
	int32_t Line() const;
};
CL_NS_END
#endif
